"Because you gave it to her," said Harry. "In Flourish and Blotts. You picked up her old Transfiguration book and slipped the diary inside it, didn't you?"[br]He saw Mr. Malfoy's white hands clench and unclench.[br]"Prove it," he hissed.
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"The Leaky Song" by Brad Mehlenbacher of Draco and the Malfoys